21 lines
515 B
ArmAsm
21 lines
515 B
ArmAsm
|
/* $OpenBSD: strlen.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */
|
||
|
|
/*
|
||
|
|
* Written by J.T. Conklin <jtc@netbsd.org>.
|
||
|
|
* Public domain.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <machine/asm.h>
|
||
|
|
|
||
|
|
ENTRY(strlen)
|
||
|
|
pushl %edi
|
||
|
|
movl 8(%esp),%edi /* string address */
|
||
|
|
cld /* set search forward */
|
||
|
|
xorl %eax,%eax /* set search for null terminator */
|
||
|
|
movl $-1,%ecx /* set search for lots of characters */
|
||
|
|
repne /* search! */
|
||
|
|
scasb
|
||
|
|
notl %ecx /* get length by taking complement */
|
||
|
|
leal -1(%ecx),%eax /* and subtracting one */
|
||
|
|
popl %edi
|
||
|
|
ret
|